// Hide\display the additional CEP widget is appropriate
private void operatorChanged(OperatorSelection selection) {
parametersContainer.clear();
String operator = selection.getValue();
if (CEPOracle.isCEPWindowOperatorTime(operator)) {
AbstractRestrictedEntryTextBox txt = new CEPTimeParameterTextBox(hcw.getWindow(), 1);
initialiseTextBox(txt);
} else if (CEPOracle.isCEPWindowOperatorLength(operator)) {
AbstractRestrictedEntryTextBox txt = new CEPLengthParameterTextBox(hcw.getWindow(), 1);
initialiseTextBox(txt);
} else {
parametersContainer.setVisible(false);
hcw.getWindow().clearParameters();
}
}
/** Drop-down Widget for Operators including supplementary controls for CEP operator parameters */
public class CEPWindowOperatorsDropdown extends Composite
implements HasValueChangeHandlers<OperatorSelection> {
private List<String> operators = CEPOracle.getCEPWindowOperators();
private ListBox box;
private HorizontalPanel parametersContainer = new HorizontalPanel();
private HorizontalPanel windowContainer = new HorizontalPanel();
private boolean isReadOnly = false;
protected HasCEPWindow hcw;
// Parameter value defining the server-side class used to generate DRL for CEP operator parameters
private static final String CEP_OPERATOR_PARAMETER_GENERATOR =
"org.kie.guvnor.guided.rule.backend.server.util.CEPWindowOperatorParameterDRLBuilder";
public CEPWindowOperatorsDropdown() {
windowContainer.setStylePrimaryName(GuidedRuleEditorResources.INSTANCE.css().container());
initWidget(windowContainer);
}
public CEPWindowOperatorsDropdown(HasCEPWindow hcw, boolean isReadOnly) {
this();
this.isReadOnly = isReadOnly;
setCEPWindow(hcw);
}
public void setCEPWindow(HasCEPWindow hcw) {
this.hcw = hcw;
windowContainer.clear();
windowContainer.add(getDropDown());
windowContainer.add(getOperatorExtension());
}
/**
* Gets the index of the currently-selected item.
*
* @return
*/
public int getSelectedIndex() {
return box.getSelectedIndex();
}
/**
* Gets the value associated with the item at a given index.
*
* @param index
* @return
*/
public String getValue(int index) {
return box.getValue(index);
}
// Additional widget for CEP Window operator parameter
private Widget getOperatorExtension() {
parametersContainer.setStylePrimaryName(GuidedRuleEditorResources.INSTANCE.css().container());
return parametersContainer;
}
// Hide\display the additional CEP widget is appropriate
private void operatorChanged(OperatorSelection selection) {
parametersContainer.clear();
String operator = selection.getValue();
if (CEPOracle.isCEPWindowOperatorTime(operator)) {
AbstractRestrictedEntryTextBox txt = new CEPTimeParameterTextBox(hcw.getWindow(), 1);
initialiseTextBox(txt);
} else if (CEPOracle.isCEPWindowOperatorLength(operator)) {
AbstractRestrictedEntryTextBox txt = new CEPLengthParameterTextBox(hcw.getWindow(), 1);
initialiseTextBox(txt);
} else {
parametersContainer.setVisible(false);
hcw.getWindow().clearParameters();
}
}
private void initialiseTextBox(AbstractRestrictedEntryTextBox txt) {
String key = String.valueOf(1);
String value = hcw.getWindow().getParameter(key);
if (value == null) {
value = "";
hcw.getWindow().setParameter(key, value);
}
if (!txt.isValidValue(value, false)) {
value = "";
hcw.getWindow().setParameter(key, value);
}
txt.setText(value);
txt.setEnabled(!isReadOnly);
parametersContainer.add(txt);
parametersContainer.setVisible(true);
hcw.getWindow()
.setParameter(
SharedConstants.OPERATOR_PARAMETER_GENERATOR, CEP_OPERATOR_PARAMETER_GENERATOR);
}
// Actual drop-down
private Widget getDropDown() {
String selected = "";
String selectedText = "";
box = new ListBox();
box.setEnabled(!isReadOnly);
box.addItem(HumanReadableConstants.INSTANCE.noCEPWindow(), "");
for (int i = 0; i < operators.size(); i++) {
String op = operators.get(i);
box.addItem(HumanReadable.getOperatorDisplayName(op), op);
if (op.equals(hcw.getWindow().getOperator())) {
selected = op;
selectedText = HumanReadable.getOperatorDisplayName(op);
box.setSelectedIndex(i + 1);
}
}
selectItem(hcw.getWindow().getOperator());
// Fire event to ensure parent Widgets correct their state depending on selection
final HasValueChangeHandlers<OperatorSelection> source = this;
final OperatorSelection selection = new OperatorSelection(selected, selectedText);
Scheduler.get()
.scheduleFinally(
new Command() {
public void execute() {
operatorChanged(selection);
ValueChangeEvent.fire(source, selection);
}
});
// Signal parent Widget whenever a change happens
box.addChangeHandler(
new ChangeHandler() {
public void onChange(ChangeEvent event) {
String selected = box.getValue(box.getSelectedIndex());
String selectedText = box.getItemText(box.getSelectedIndex());
OperatorSelection selection = new OperatorSelection(selected, selectedText);
operatorChanged(selection);
ValueChangeEvent.fire(source, selection);
}
});
return box;
}
/** Allow parent Widgets to register for events when the operator changes */
public HandlerRegistration addValueChangeHandler(ValueChangeHandler<OperatorSelection> handler) {
return addHandler(handler, ValueChangeEvent.getType());
}
/**
* Select a given item in the drop-down
*
* @param operator The DRL operator, not the HumanReadable form
*/
public void selectItem(String operator) {
String currentOperator = box.getValue(box.getSelectedIndex());
if (currentOperator.equals(operator)) {
return;
}
for (int i = 0; i < box.getItemCount(); i++) {
String op = box.getValue(i);
if (op.equals(operator)) {
box.setSelectedIndex(i);
break;
}
}
String selected = box.getValue(box.getSelectedIndex());
String selectedText = box.getItemText(box.getSelectedIndex());
OperatorSelection selection = new OperatorSelection(selected, selectedText);
operatorChanged(selection);
}
}